The second hint then came from that very performance – with Foo Fighters sharing footage on Twitter.

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“This is a jam”, they wrote. The tweet was subsequently retweeted by Nirvana’s official account.

The rumours were given further substance by the festival’s line-up too. As well as ex-Nirvana members Dave Grohl and Pat Smear being in Foo Fighters, former Nirvana bassist Krist Novoselic is due to appear with his band, Giants In The Trees.

They’ll also be joined on the line-up by Deer Tick, whose singer John McCauley performed in the 2014 Nirvana reunion.

Foo Fighters are yet to officially comment on the speculation.

Meanwhile, Dave Grohl recently played Nirvana’s ‘In Bloom’ for only the second time since Kurt Cobain’s death. In September, Grohl took to the stage to drum along to the seminal single from ‘Nevermind’ with Trombone Shorty at Los Angeles’ Voodoo Threauxdown Festival.